4 Information requirements

This clause specifies the information requirements for the Shape composition application module. The information requirements are specified as the Application Reference Model (ARM) of this application module.

NOTE 1  A graphical representation of the information requirements is given in Annex C.

NOTE 2  The mapping specification is specified in 5.1. It shows how the information requirements are met by using common resources and constructs defined or imported in the MIM schema of this application module.

This clause defines the information requirements to which implementations shall conform using the EXPRESS language as defined in ISO 10303-11. The following begins the Shape_composition_arm schema and identifies the necessary external references.

4.1 Required AM ARM

The following EXPRESS interface statement specifies the elements imported from the ARM of another application module.

EXPRESS specification:

*)
USE FROM Shape_property_assignment_arm;    --  ISO/TS 10303-1032
(*



NOTE 1   The schemas referenced above are specified in the following part of ISO 10303:

Shape_property_assignment_arm

ISO/TS 10303-1032

NOTE 2   See Annex C, Figures C.1and C.2 for a graphical representation of this schema.

4.2 ARM entity definitions

This subclause specifies the ARM entities for this module. Each ARM application entity is an atomic element that embodies a unique application concept and contains attributes specifying the data elements of the entity. The ARM entities and definitions are specified below.

4.2.1 Composite_group_shape_element   

EXPRESS specification:

*)
ENTITY Composite_group_shape_element
  SUBTYPE OF (Composite_shape_element);
END_ENTITY;
(*

4.2.2 Composite_shape_element   

EXPRESS specification:

*)
ENTITY Composite_shape_element
  ABSTRACT SUPERTYPE OF (ONEOF (Composite_group_shape_element,
                                Composite_unit_shape_element))
  SUBTYPE OF (Shape_element);
  components : SET[2:?] OF Shape_element;
END_ENTITY;
(*

Attribute definitions:

components: specifies the role of the Shape_element for the Composite_shape_element. There shall be two or more Shape_elements for a Composite_shape_element.

4.2.3 Composite_unit_shape_element   

A Composite_unit_shape_element is a type of Composite_shape_element that is treated as a unit, as opposed to as a group of individual Shape_element.

EXAMPLE 1   A Surface_profile_tolerance is applied to a square cut-out that goes through a printed circuit board. The square cut-out is a Composite_unit_shape_element that consists of the four constituent Shape_elements that correspond to the four surfaces of the cut-out.

EXAMPLE 2   A Flatness_tolerance may be applied to a Composite_unit_shape_element to specify that the coplanar surfaces that make up the Composite_unit_shape_element are required to fall within a common Tolerance_zone.

NOTE    Common tolerance zones are described in 7.5 of ISO 1101.

EXPRESS specification:

*)
ENTITY Composite_unit_shape_element
  SUBTYPE OF (Composite_shape_element);
END_ENTITY;
(*

© ISO 2014 — All rights reserved